//
//  WBOAuthViewController.swift
//  MyWeibo
//
//  Created by 5201-mac on 2017/5/8.
//  Copyright © 2017年 wlb-mac. All rights reserved.
//

import UIKit

/// 通过 webView 加载新浪微博授权页面控制器
class WBOAuthViewController: UIViewController {

    private lazy var webView = UIWebView()
    
    override func loadView() {
        view = webView
        view.backgroundColor = UIColor.white
        
        // 设置代理
        webView.delegate = self
        
        // 设置导航栏
        title = "登录新浪微博"
        // 导航栏按钮
        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "返回", target: self, action: #selector(close), isBack: true)
        
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "自动填充", target: self, action: #selector(autoFill))
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // 加载授权页面
        let urlString = "https://api.weibo.com/oauth2/authorize?client_id=\(WBAppKey)&redirect_uri=\(WBRedirectURI)"
        // 1> URL 确定要访问的资源
        guard let url = URL(string: urlString) else{
            return
        }
        // 2> 建立请求
        let request = URLRequest(url: url)
        // 3> 加载请求
        webView.loadRequest(request)
    }
    
    // MARK: - 监听方法
    @objc private func close() {
        dismiss(animated: true, completion: nil)
    }
    
    /// 自动填充 - WebView的注入，直接通过js修改‘本地浏览器中’缓存的页面内容
    /// 点击登录按钮，执行submit()将本地数据提交给服务器
    @objc private func autoFill() {
        
        // 准备js
        let js = "document.getElementById('userId').value = '17858955589';" + "document.getElementById('passwd').value = 'weng10-..';"
        // 让webview执行js
        webView.stringByEvaluatingJavaScript(from: js)
    }

}

extension WBOAuthViewController: UIWebViewDelegate {
    
    /// webView 将要加载请求
    ///
    /// - Parameters:
    ///   - webView: webView
    ///   - request: 要加载的请求
    ///   - navigationType: 导航类型
    /// - Returns: 是否加载request
    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
        print("加载请求 --- \(request.url?.absoluteString)")
        return true
    }
}
